Research Papers: Techniques and Procedures

Experimental Measurement of Vortex Ring Screen Interaction Using Flow Visualization and Molecular Tagging Velocimetry

[+] Author and Article Information
John T. Hrynuk

Vehicle Technologies Directorate,
Army Research Lab,
4603 Flare Loop,
Aberdeen Proving Ground, MD 21005
e-mail: john.t.hrynuk.civ@mail.mil

Colin M. Stutz

Department of Mechanical and
Aeronautical Engineering,
Clarkson University,
8 Clarkson Avenue Box 5725,
Potsdam, NY 13699
e-mail: stutzcm@clarkson.edu

Doug G. Bohl

Department of Mechanical and
Aeronautical Engineering,
Clarkson University,
8 Clarkson Avenue Box 5725,
Potsdam, NY 13699
e-mail: dbohl@clarkson.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 4, 2017; final manuscript received April 3, 2018; published online May 28, 2018. Assoc. Editor: Samuel Paolucci. This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.

J. Fluids Eng 140(11), 111401 (May 28, 2018) (11 pages) Paper No: FE-17-1011; doi: 10.1115/1.4040215 History: Received January 04, 2017; Revised April 03, 2018

The interaction of vortex rings with thin wire mesh screens is investigated using laser-induced fluorescence (LIF) and molecular tagging velocimetry (MTV). The existence of vortex shedding from individual wires of the porous screens, suggested by prior works, is shown and compared to flow visualization results. A range of interaction Reynolds numbers and screen porosities are studied to determine the conditions affecting the interaction. Transmitted vortex (TV) ring formation is shown to be a function of vortex shedding and the shedding Reynolds number, but not a function of porosity. Screen porosity is shown to affect the TV convective speed but did not impact the formation behaviors. Three major flow regimes existed for the interaction: TV formation with no vortex shedding, TV formation with visible vortex shedding, and no downstream formation with strong shed vortices.

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Grahic Jump Location
Fig. 1

(a) Experimental setup and (b) free vortex characterization

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Fig. 2

(a) Undelayed MTV image t = t0, (b) delayed MTV image t = t0 + Δt, and (c) resulting displacement vector field

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Fig. 3

Sample screens: (a) Dwire = 0.0178 cm, (b) Dwire = 0.104 cm, and (c) Dwire = 0.267 cm

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Fig. 4

Free vortex progression (Z = 70 cm)

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Fig. 5

(a) Vortex tracking for LIF and MTV results and (b) convective velocities using LIF positions

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Fig. 6

Vortex interaction with screens: (a) Rei = 24, (b) Rei = 143, and (c) Rei = 373

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Fig. 7

Vortex interaction MTV Results for: (a) Rei = 24, (b) Rei = 143, and (c) Rei = 373

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Fig. 8

Laser-induced fluorescence and MTV vortex ring interaction for Rei = (a) 17, (b) 24, (c) 102, (d) 143, (e) 266, and (f) 373

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Fig. 9

Vortex tracking and circulation: (a) Rei = 24, (b) Rei = 143, and (c) Rei = 373

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Fig. 10

Vortex interactions and shedding behavior

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Fig. 11

Vortex convection and porosity Red = 55



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